Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
MACHINING STRATEGIES IN THIN-WALLS USING SACRIFICE STRUCTURES
Submission Author:
Givan Martins Junior , MG , Brazil
Co-Authors:
Givan Martins Junior, Rafael Mundim, Anderson Vicente Borille, Eliene Oliveira Lucas
Presenter: Givan Martins Junior
doi://10.26678/ABCM.COBEM2019.COB2019-0121
Abstract
The objective was to establish a new machining strategy in the milling of thin-walled parts,which due to their low stiffness, are more susceptible to dynamic instabilities. The aluminum alloy 7050 T7451, which due to its structural properties is widely used in the aerospace industry, was chosen for the study. One method used for the machining of pieces of thin walls consists of the addition of wax or similar material, to serve as a reinforcement for the piece and to favor the damping's factor during the milling process. Another approach is to select strategies and parameters that minimize the vibration such as the use of sacrificial structures. These structures are generated during the roughing of the part and are removed after the subsequent finishing operation. In view of the foregoing, it was proposed ways of increasing the rigidity of the part by means of sacrificial structures. Experiments were carried out in machine to experimentally evaluate the strategies. The structure that presented the highest efficiency was the waterline structure, where the thinnest section is supported by thicker sections below as they are machined.
Keywords
Thin-walled milling;, Structures of sacrifice;, Cutting forces
